Fuel supply system



June 18, 1957 J. DOLZA 2,796,057

FUEL SUPPLY SYSTEM Fil ed Dec. 15, 1954 2 Sheets-Sheet 1 4 EWZM AI TORNEl Safes The present invention relates to internal combustion engines and more particularly to the fuel supply systems therefor.

In spark ignited engines, it has been the practice to employ a carburetor for atomizing and mixing a liquid fuel with air to flow a combustible charge. The charge is then conducted to the various cylinders by an intake manifold having a plurality of distribution passages communicating with the cylinders. In order to insure an adequate supply of fuel to the carburetor at all times, a fuel pump may be employed for transferring fuel from the fuel tank to the carburetor. Heretofore, these fuel pumps have normally been mounted on the side of the engine to be driven from'the camshaft. The fuel pump is then interconnected with the carburetor by means of tubing that extends therebetween. This places a large portion of the fuel supply system in close heat exchanging relation with the engine and, as a consequence, the fuel supply system and the fuel therein absorb enough heat to materially mite:

atent' G T raise the temperature thereof. Since the fuel is normally a very volatile substance such as gasoline, the increased temperature may cause vaporization of the fuel and a vapor lock in the fuel system.

It is now proposed to provide a fuel supply system that is adapted to be mounted on an engine so as to absorb the minimum amount of heat therefrom. This may be accomplished by employing mounting means that will receive both the fuel pump and the carburetor and allow them to be mounted adjacent each other on the intake manifold. The intake manifold will be cooler than the engine due to the cooling effects of vaporizing fuel and the initially cooler inlet air. Therefore if the manifold is disposed between the pump and carburetor, it will act as a shield thereby greatly reducing the amount of heat transferred from the engine to the fuel supply systern. Also since the fuel pump will be mounted adjacent the carburetor, the mounting means may include a throttle body for the carburetor and a base for the fuel pump. Since they may be contiguous with each other, a pas sage may be provided through the mounting means for directly interconnecting the pump and carburetor. It will thus be seen that when the fuel pump and carburetor are properly positioned on the mounting means, the fuel pump will be interconnected with the carburetor fuel bowl without the necessity of employing any additional tubing. This will not only eliminate the expense of the tubing but will also materially reduce the amount of tubing in heat exchanging relation with the engine. Thus there will be a substantial reduction in the amount of heattransferred to the fuel supply system. By placing the fuel pump on the intake manifold, it will normally be remotely disposed from the camshaft. Accordingly, a push rod may be reciprocably disposed in a passage extending through the intake manifold and the cylinder block to drivingly interconnect the fuel pump rocker arm with an eccentric on the camshaft.

Although mounting the fuel supply system on top of the intake manifold will greatly reduce the transfer of heat from the engine to the fuel supply system, the fuel supply system may also be disposed inside of the induction system. This will allow the fuel supply system to be disposed in the fiow of air entering the induction system. Thus in addition to reducing the amount of heat transferred to the fuel supply system, the cool air entering the Figure 1 is a fragmentary cross sectional view of an engine having a fuel supply system employing the present invention.

Figure 2 is a plan view of the fuel supply system taken substantially along the plane of line 2-2 in Figure 1.

Figure 3 is a side view of the fuel supply means of Figure 1 on a slightly enlarged scale with portions thereof being broken away.

Referring to the drawings in more detail, the present invention is particularly adapted for use with a so-called V-type engine 10 having a cylinder block 12 with a pair of angularly disposed banks of cylinders. However, it should be understood that it may be equally well adapted for use on any type of engine.

The present engine 10 includes an induction system 14 disposed in the space between the banks of cylinders. This induction system 14 includes an intake manifold 16 that has the opposite sides thereof abutting the cylinder heads on the block 12. A plurality of distribution passages 18 in the manifold 16 may communicate with the various cylinders for conveying a combustible charge thereto. Intake and exhaust valves may be provided for controlling the flow of gases into and out of these cylinders. A camshaft 20 having a plurality of earns 22 axially spaced therealong may be disposed between the banks and extend longitudinally of the engine 10.

In addition to the intake manifold 16, the induction system 14 may also include an air cleaner and silencer assembly 24 which is mounted on the manifold 16. The present assembly 24 comprises a housing 26 having a chamber 28 inside thereof. A filter element 30 may be horizontally disposed inside of the housing 26 to divide the chamber 28 into an upper compartment 32 and a lower compartment 34. An extension may be formed by one wall of the housing 26 that projects forwardly to form an intake passage 36. One end of this intake passage 36 may be open to the atmosphere while the other end communicates with the lower compartment 34.

A carburetor 38 may be positioned on mounting means 40 secured to the upper surface of the intake manifold 16. The mounting means 40 is preferably disposed in the lower compartment 34 with the carburetor intake 42 projecting upwardly through the filter element 30 to com municate with the upper compartment 32; The carburetor 38 may have a fuel mixing passage therethrough that is adapted to discharge a combustible fuel mixture into the distribution passages 18. Thus the air for the induction system 14 may be drawn through the intake passage 36, the lower compartment 34, the filter element 30, the upper compartment 32, the carburetor38 and out through the distribution passages 18.

In order to insure delivery of an adequate supply of fuel to the carburetor 38, the fuel supply system 44 may include a fuel pump 46 that is seated on the mounting means 40 and is adapted to transfer fuel from the fuel tank to the carburetor fuel bowl 48. Although the fuel pump 46 may be of any desired construction, in the present instance it is of the so-called diaphragm type in which a flexible diaphragm 50 is moved into and'out of a pumping chamber 52 formed inside of the pump body 54. The diaphragm 50 may be disposed between a pair of backing plates 56 that will stiffen the diaphragm and thereby improve the pumping action. Intake and outlet valves 58 may be provided to control the flow of fuel into and out of the pumping chamber 52. The outlet valve 58 is provided to discharge fuel through an outlet passage 60 in the pump body 54.

"The mounting means 40 for the fuel supply system 44 Fatented June 18, 1957 3 is preferably adapted to be secured to theupper surface of the intake manifold 16. The portion of the mounting means adapted to receive the carburetor 38 may comprise a throttle body 62 having a vertical passage 64 therethrough for interconnecting the mixture forming pa ssage in the carburetor with the distribution passages 18. A throttle valve may be disposed in this passage 64. A linkage system 66 may be provided for positioning the throttle valve to control the amount of the charge flowing therethrough.

That portion 68 of the mounting means 40 adapted to receive the fuel pump 46 may be disposed directly over a cavity 70 in the intake manifold 16. This cavity 70 may be adapted to receive a rocker arm 72 pivotally mounted on the bottom of the lower pump body 73. One end 74 of the rocker arm 72 may be connected to the reinforcing plates 56 by means of a vertical link 76. The other end 78 of the rocker arm 72 may be adapted to engage the upper end of a vertical push rod 80 which has the lower end thereof riding on an eccentric 82 on the camshaft 20. Springs 84 and 85 may be provided for biasing the rocker arm 72 against the push rod 80 and the diaphragm upwardly into the pumping chamber 52.

A conduit 81 may be formed in the mounting means 40 so as to interconnect the discharge passage with the fuel bowl 48 and thereby eliminate the necessity for any additional tubing. In the present instance this conduit 81 comprises a group of drilled passages 83 which extend through the throttle body 62 of the mounting means 40. One end of these passages 83 will form an opening 86 that registers with a duct 88 communicating with the carburetor fuel bowl 48. The other end of these passages 84 may form an opening adapted to register with a vertical passage 90 in the other portion 68 of the mounting means 40 that forms an opening 92. This opening 92 may be adapted to register with the end of the discharge passage 60 in the fuel pump 46.

It will thus be seen that a fuel supply system has been provided which is adapted to be mounted on top of the intake manifold so as to substantially reduce or eliminate the transfer of heat from the engine to the fuel supply system and the necessity for providing expensive and heat absorbing tubing between the fuel pump and the carburetor have been eliminated.

It is to be understood that, although the invention has been described with specific reference to a particular embodiment thereof, it is not to be so limited since changes and alterations therein may be made which are within the full intended scope of this invention as defined by the appended claims.

What is claimed is:

1. A mounting for a fuel supply system on an engine, said mounting having a fuel supply passage therein with the opposite ends thereof forming an inlet and an outlet, a portion of said mounting forming a support for a carburetor having an inlet opening positioned to register with said outlet, another portion of said mounting forming a support for a fuel pump having a discharge opening in one side thereof positioned to register with said inlet.

2. A mounting for a fuel supply system on an engine, said mounting comprising at least one member adapted to be secured to said engine and form a carburetor support and a fuel pump support, fuel supply passage means extending through said member to form an inlet opening and an outlet opening, said inlet opening being positioned to register with a discharge opening in said fuel pump and said outlet opening being positioned to register with an intake passage in said carburetor.

3. A mounting adapted to be secured to an engine for supporting a fuel supply system for said engine, said mounting comprising at least one member adapted to be secured to said engine to form a throttle body and a fuel pump support, said throttle body being adapted to receive a carburetor having an intake passage, said fuel pump support being adapted to receive a fuel pump having a discharge passage, a fuel supply passage extending through said member with one end thereof positioned to communicate with said discharge passage and the other end being positioned to communicate with said intake passage.

4. A mounting for a fuel supply system on an engine, said mounting comprising a first member and a second member adapted to be secured to said engine with the adjacent sides of said members abutting each other, said first member being adapted to support a fuel pump having a discharge pas-sage therein, said first member having a passage with one end thereof positioned to communicate with said discharge passage and the other end thereof forming an outlet opening in said adjacent side of said first member, said second member forming a throttle body adapted to receive a carburetor having an inlet passage, said second member having a passage with one end thereof communicating with said inlet passage and the other end thereof forming an inlet in the adjacent side of said second member positioned to register with said outlet opening in said first member.

5. In an engine having a fuel supply system including a fuel pump having an outlet for discharging fuel there from and a carburetor having an intake for receiving the fuel discharge from said fuel pump, a mounting for securing said fuel pump and said carburetor to said engine, said mounting having a fuel supply passage extending there through with the opposite ends thereof forming openings in the sides of said mounting, a portion of said mounting being adapted to receive said fuel pump, one of said openings being positioned to register with said outlet, another portion of said mounting being adapted to receive said carburetor, the other of said openings being positioned to register with said inlet.

6. In an engine having a fuel supply system including a fuel pump having an outlet for discharging fuel therefrom and a carburetor having an intake for receiving the fuel discharged from said fuel pump, a mounting for securing said fuel pump and said carburetor to said engine, said mounting having a fuel supply passage extending therethrough with the opposite ends thereof forming openings in said mounting, a portion of said mounting being adapted to receive said fuel pump and including one of said openings positioned to register with said outlet, another portion :of said mounting being adapted to form a throttle body for said carburetor and including the other of said openings positioned to register with said intake.

7. A fuel supply system for an engine comprising car buretor means and fuel pump means, said carburetor means including a fuel supply passage forming an inlet in one side of said carburetor means, said fuel pump means including a fuel supply passage having one end thereof forming a discharge opening in one side of said fuel pump means, said means being adapted to be secured to said engine with said sides abutting each other, said openings being positioned to register with each other to form a continuous uninterrupted fuel supply passage intercon' necting said fuel pump means and said carburetor means.

8. A fuel supply system for an engine having an intake manifold comprising a mounting adapted to be secured to said intake manifold, said mounting having a fuel passage extending therethrough with one end thereof forming an inlet and the other end forming an outlet, carburetor means secured to said mounting and having a fuel bowl and an intake passage, one end of said intake passage communicating with said fuel bowl and the other end of said intake passage forming an opening registering with said outlet, and fuel pump means secured to said mounting and having a discharge passage therethrough forming an opening positioned to communicate with said inlet.

Anderson Jan. 4, 1938 Sullivan June 6, 1939 

